|This article is about a/an episode in Kamen Rider Drive.|
Who Does the Warrior Fight For? (戦士はだれのために戦うのか Senshi wa Dare no Tame ni Tatakau no ka) is the sixth episode of Kamen Rider Drive. Following the introduction of Shift Wild in the previous episode, it introduces Shift Mad Doctor and features the debut of Drive Type Speed Doctor, Type Wild, and Type Wild Dump, as well as Tridoron Type Wild.
While Shinnosuke is still under the effects of Brain's poison, he must figure out how to stop the Crash Roidmude from obtaining explosives from the Font-R company, when its president prevents the Special Investigations Division from looking into his factory.
After being poisoned by Brain, Drive struggles with himself to resist the poison's effect. Kiriko sent Dream Vegas to help him escape from the villains. Drive was washed to a nearby shore and received a painful medical treatment from Mad Doctor Shift Car. He found himself at Kotoha Hospital and since the Font-R company was found with the explosives, the Special Investigation Unit is currently interrogate him.
In the Unit's office, Eiji officially disbanded the team and took over their office while Rinna still retained her position. Crush and 074 went out, bringing along a large number of Viral Cores as they pursue the Font-R president Kuramochi for more explosives. At the cafeteria, Genpachiro finally accepted the existence of Roidmudes to Kyu and Kiriko came in to ask for their help. While Shinnosuke doubted Chase's claim that justice never existed, Captain Jun gave Shinnosuke Yuuzou Ichikawa's number, the man that saved him from the shore. Contacting Ichikawa, Shinnosuke thanked him for the rescue but Ichikawa instead said his heroic deed earlier was from his inspiration on Drive, revealing him to be the driver that Drive saved before thus restoring Shinnosuke's faith in humanity. Ichikawa however spotted the president being attacked by the same Roidmude gang from before and caught himself in a Heavy Acceleration wave.
Shinnosuke entered "top-gear" state, and rushed to the Unit's office, where he ordered Rinna to restart the program as she agreed. While Shinnosuke off to Font-R building, Eiji tried to protest but Kiriko, Genpachiro and Kyu stopped him, revealing that Eiji was all along bribed by Kuramochi to protect the smuggled explosives via the Unit and Kamen Rider Drive. But when the unit found his secret, Eiji tried to shut the team. Rinna revealed her tricks to Eiji and played along with his plans while instructed Kiriko to investigate the latter's relation with Font-R. As Shinnosuke drove to the building, Chase stopped him in the midway and criticize his desire to protect humans but Shinnosuke said otherwise and gained his passion to assume Drive Type Wild and fight. Using Type Wild Dump, he execute Drirumble to defeat Mashin Chaser and continue his journey to Font-R.
Meanwhile, several portion of Font-R building was severely destroyed and the Roidmudes took their supply of explosives. Drive appeared and saved the president from being killed. Roidmude 074 devoured three Viral Cores and transformed into a Giant Cobra Roidmude. With Tridoron changed into Type Wild, Drive used it to attack the giant cobra before eliminating it with Rumble Dump. With Crush left, Rinna appeared and gave Drive Type Wild the Handle-Ken which Mr. Belt left and finished the Roidmude with Drift Rotation. At Drive Pit, Mr. Belt revealed Rinna as his secret assistant which further angered Shinnosuke. In a newspaper office, the higher faculties thanked Kusaka for a new scoop for their newspaper article: exposure of Font-R's crimes and their factory's destruction. As Kusaka was praised, a newspaper staff envied the man.
- Shinnosuke Tomari (泊 進ノ介 Tomari Shinnosuke): Ryoma Takeuchi (竹内 涼真 Takeuchi Ryōma)
- Kiriko Shijima (詩島 霧子 Shijima Kiriko): Rio Uchida (内田 理央 Uchida Rio)
- Jun Honganji (本願寺 純 Honganji Jun): Tsurutaro Kataoka (片岡 鶴太郎 Kataoka Tsurutarō)
- Rinna Sawagami (沢神 りんな Sawagami Rinna): Rei Yoshii (吉井 怜 Yoshii Rei)
- Kyu Saijo (西城 究 Saijō Kyū): Kenta Hamano (浜野 謙太 Hamano Kenta)
- Genpachiro Otta (追田 現八郎 Otta Genpachirō): Taira Imata (井俣 太良 Imata Taira)
- Narration (ナレーション Narēshon), Drive Driver's voice (ドライブドライバーの声 Doraibu Doraibā no koe): Chris Peppler (クリス・ペプラー Kurisu Pepurā)
- Chase (チェイス Cheisu): Taiko Katono (上遠野 太洸 Katōno Taikō)
- Brain (ブレン Buren): Shota Matsushima (松島 庄汰 Matsushima Shōta)
- Heart (ハート Hāto): Tomoya Warabino (蕨野 友也 Warabino Tomoya)
- Crash Roidmude (クラッシュロイミュード Kurasshu Roimyūdo): HIRO (Yasuda Dai Circus)
- Crush's Henchman (クラッシュの子分 Kurasshu no Kobun)/Roidmude 074: Kuro-chan (クロちゃん Kuro-chan, Yasuda Dai Circus)
- Eiji Kirihara (桐原 英治 Kirihara Eiji): Takashika Kobayashi (小林 高鹿 Kobayashi Takashika)
- Mitsuru Kuramochi (倉持 満 Kuramochi Mitsuru): Tomonori Mizuno (水野 智則 Mizuno Tomonori)
- Yuzo Ichikawa (市川 勇蔵 Ichikawa Yūzō): Kohei Yamamoto (山本 康平 Yamamoto Kōhei)
- Kenta Takasugi (高杉 憲太 Takasugi Kenta): Kenta Uchino (内野 謙太 Uchino Kenta)
- Shunsuke Kusaka (久坂 俊介 Kusaka Shunsuke): Takuya Nagaoka (永岡 卓也 Nagaoka Takuya)
- Kamen Rider Drive: Seiji Takaiwa (高岩 成二 Takaiwa Seiji)
- Mashin Chaser: Yasuhiko Imai (今井 靖彦 Imai Yasuhiko)
- Brain Roidmude: Daisuke Satō (佐藤 太輔 Satō Daisuke)
- Roidmude 074: Jun Watanabe (渡辺 淳 Watanabe Jun)
Shift Cars & Viral Cores
- Car Used:
- Type Used:
- Core Used:
- Chaser Spider
- Tune Form Used:
- Tune Chaser Spider
- As part of Super Hero Time, this episode aired alongside Ressha Sentai ToQger episode 36, Station 36: A+ Dream.
- Viewership: 5.4%
- Closing Screen Shift Car
- Roidmude Count
- Answer to the episode's question: The citizens.
- This episode marks Shinnosuke's first time transforming into Drive directly into another Type, rather than transforming into his primarily used Type Speed first. In this case, Type Wild.
- It is also the first episode where Drive does not assume the normal version of Type Speed.
- This episode marks the only time Drive has used Type Speed Doctor.
- It is also the last episode to debut a new Tire Exchange mode for Type Speed.
Kamen Rider Drive Volume 2 features episode 5-8: What Are the Steel Robbers After?, Who Does the Warrior Fight For?, How Was That Decisive Moment Captured? and What is the Secret That Dwells in the Heart? 
Collection 1 comes with 12 episodes.
- TV Asahi's official summary for 「戦士はだれのために戦うのか」
- Toei TV's official episode guide for 「戦士はだれのために戦うのか」